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Lawsonia derived gene and related OmpH polypeptides, peptides and proteins and their uses

a technology of omph polypeptides and derived genes, applied in the field of derived gene and related omph polypeptides, peptides and proteins, can solve the problems of reducing the growth rate of pigs, and increasing feed costs

Inactive Publication Date: 2006-05-30
PIG RES DEV CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0035]A still further aspect of the invention provides a diagnostic method of detecting Lawsonia intracellularis or related microorganism in a biological sample derived from an animal subject, said method comprising the steps of hybridising one or more polynucleotide or oligonucleotide probes or primers derived from the nucleotide sequence set forth in SEQ ID NO: 2 or a complementary nucleotide sequence thereof or a homologue, analogue or derivative thereof, to said sample, and then detecting said hybridisation using a detection means. The detection means according to this aspect of the invention is any nucleic acid-based hybridisation or amplification reaction.

Problems solved by technology

The industry is subject to rapid economic downturn in response to disease conditions adversely affecting livestock and the quality of meat products derived therefrom, including those diseases which may potentially be transmitted to humans.
PPE is a significant cost component associated with the pig industry, especially in terms of stock losses, medication costs, reduced growth rates of pigs and increased feed costs.
PPE also contributes to downstream indirect costs in, for example, additional labour costs and environmental costs in dealing with antibiotic residue contamination, and in control measures to prevent the organism from being passed on or carried to other animals or humans.
However, such a strategy is considered to only be short to medium term, especially since governmental regulatory pressures tend to discourage animal husbandry practices which involve the use of prophylactic antibiotics.

Method used

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  • <i>Lawsonia </i>derived gene and related OmpH polypeptides, peptides and proteins and their uses
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  • <i>Lawsonia </i>derived gene and related OmpH polypeptides, peptides and proteins and their uses

Examples

Experimental program
Comparison scheme
Effect test

example 1

Sources of Pig Tissue

Infected Pig Intestines

[0219]Sections of grossly thickened ilea were taken from pigs naturally or experimentally affected by PPE. The presence of L. intracellularis bacteria in the ilea was confirmed using immunofluorescent staining with specific monoclonal antibodies (McOrist et al, 1987). An example of a suitable antibody is monoclonal antibody IG4 available from the University of Edinburgh, UK.

example 2

Isolation of Lawsonia Intracellularis Bacteria from the Infected Pig Ileum

[0220]Lawsonia intracellularis bacteria were extracted directly from lesions of PPE in pigs by filtration and further purified over a Percoll (Pharmacia, Uppsala, Sweden) gradient as follows. Infected ilea were collected from pigs and the presence of L. intracellularis was confirmed histologically before storage at −80° C. Sections of ileum were thawed and approximately 8 g of infected mucosa were scraped from the intestinal wall. The mucosa was homogenised with 40 ml sterile phosphate buffered saline (PBS) on half speed for 10 seconds using a Sorvall omnimixer. This suspension was centrifuged at 2000×g for 4 minutes. The supernatant was discarded and the cell pellet was resuspended in 40 ml PBS and re-centrifuged. This washing step was repeated twice. The cell pellet was then resuspended in 20 ml PBS and homogenised at full speed for one minute to release L. intracellularis bacteria.

[0221]This homogenate was ...

example 3

Purification of Lawsonia Intracellularis Genomic DNA

[0222]Genomic DNA was extracted from Percoll-gradient purified Lawsonia intracellularis bacteria recovered from infected pig ilea scrapings (Example 2) by the methods described by Anderson et al (1984) and Sambrook et al (1989).

[0223]Briefly, the L. intracellularis cells were pelleted by centrifugation at 14,000×g at 4° C. for 15 min. The cells were resuspended in 10 ml of TE buffer (1 mM Tris-HCl, 0.1 mM EDTA, pH 8.0) and centrifuged as before. The pellet was then resuspended in 4 ml of TE buffer containing 4 mg / ml lysozyme (Sigma Chemical Co.) and incubated at 37° C. for 20 min. SDS and proteinase K (Promega, Wis., USA) were added to final concentrations of 1% (w / v) and 200 μg / ml, respectively, and incubation was continued at 45° C. for 4 hours. The lysate was then extracted with an equal volume of phenol, phenol:chloroform (1:1) and chloroform, respectively, and the nucleic acids were recovered from the supernatant by ethanol pr...

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Abstract

The present invention relates generally to therapeutic compositions for the treatment and / or prophylaxis of intestinal disease conditions in animals and birds caused or exacerbated by Lawsonia intracellularis or similar or otherwise related microorganism. In particular, the present invention provides a novel gene derived from Lawsonia intracellularis which encodes an immunogenic OmpH peptide, polypeptide or protein that is particularly useful as an antigen in vaccine preparation for conferring humoral immunity against Lawsonia intracellularis and related pathogens in animal hosts. The present invention is also directed to methods for the treatment and / or prophylaxis of such intestinal disease conditions and to diagnostic agents and procedures for detecting Lawsonia intracellularis or similar or otherwise related microorganisms.

Description

[0001]This is the U.S. National phase under 35 U.S.C. §371 of International application PCT / AU00 / 00438, filed May 11, 2000, and claims priority to U.S. Provisional Application 60 / 133,986, filed May 13, 1999, both of which are herein incorporated by reference.FIELD OF THE INVENTION[0002]The present invention relates generally to therapeutic compositions for the treatment and / or prophylaxis of intestinal disease conditions in animals and birds caused or exacerbated by Lawsonia intracellularis or similar or otherwise related microorganism. In particular, the present invention provides a novel gene derived from Lawsonia intracellularis which encodes an immunogenic peptide, polypeptide or protein. The polypeptide described herein, designated as OmpH, or a peptide homologue, analogue or derivative thereof is particularly useful as an antigen in vaccine preparation for conferring humoral immunity against Lawsonia intracellularis and related pathogens in animal hosts. The present invention ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): A61K39/02A61K39/00C07K14/195
CPCC07K14/205
Inventor HASSE, DETLEFPANACCIO, MICHAELSINISTAJ, MERI
Owner PIG RES DEV CORP
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